Compound band-brake.



H. A. STEEN.

COMPOUND BAND BRAKE.

APPLlcAnou man oc.2.191s.

UNITED STATES PATENT OFFICE.

`HALE'I'JAN VA. STEEN,4 0F CHBISTIANIA, NORWAY, ASSIGNOR TOALLIS-GHALMEBS MANUFACTURING COMPANY, A CORPORATION OF DELAWARE.

COMPOUND BAND-BRAKE.

1,282,483. -Srwiwtim f Letters Patent Patented Oct. 22, 1918.

Original application llled October 27, 1910, Serial No. 589,435. RenewedOctober 27, 1916, Serial No. 129,000. Divided and this application ledOctober 2, 1916. Serial No. 123,791.

To all whom it may concern: signed in accordance with my invention; 55-Be it known that I, HALFDAN A. STEEN, a and subject of the King ofNorway, residing at Fig. 2 is an end elevation of the brake Christiania,in the country of Norway, have shown in Fig. 1.

5 invented a certain new and useful Improve- In accordance with thedisclosure of the ment in Compound Band-Brakes, of which drawings, I usea. com ound brake having 60 the following is a specification. only onebraking sur ace and one brake This invention relates to brakes 'andparband, but I have provided an arrangement ticularly to band brakes.whereby the value of the retarding force When motors areused for drivingcranes originally developed is multiplied many and for operating hoists,it is advantageous times by an automatic action of the brake 65 toprovide a braking device by which the structure. The brake wheel 61having a motor is promptly and automatically single braking surface, ismounted on a brought to rest upon the interruption of shaft 62 and 1sadapted to be engaged by a electric supply circuit connections, or inbrake band 63 the ends of which are secured case of accident tomechanical parts. This to the end portions of arms 64 and 65, re- 70result is usually accomplished by providing spectively, which arepivoted at points 66 a spring or some similar mechanical means and 67,respectively, to a base 68. The brake for applying the brake and anelectro-reband is preferably of the type specifically sponsive devicefor releasing the brake.v described in the above mentioned copendingBand brakes have been employed for these application. The arms 64 and 65are pro- 'I5 purposes but compound band brakes capable vided withbrackets 69 and 70, respectively, of effectively multiplying the energyofreadapted to engage adjustable stops 71 and tarding forces heretoforehave not been ob- 72, respectively, on the base structure 68.

tained. The arms 64 and 65 are biased toward each y The compound bandbrakes which I have other by the action of a spring 73, the effec-f 80provided are effective for both directions of tive tensional force ofwhich may be varied motor rotation Without sacrificing the eiii- `byad'usting a screw 74. The arm 64 is con ciency of the brakes, and acomparatively necte through a rod 75, crank 7 6, and rod light springmay be employed for setting or 77, to the movable member 78 of themagapplying the band brake, thus permitting net 79 which, whenenergized, is effective to 85 the use of a light electro-magnet forreleashold the arms 64, 65, separated to such an ing the same. Thepresent application is a extent that the brake band 63 is free of thedivision of applicants copending applicabrake Wheel. A spring 80 acts tocountertion, Ser. No. 589,435, led Oct. 27, 1910, rebalance the weightof the movable member newed Oct. 27, 1916, Serial No. 129,000. 78 of themagnet. The arms 64 and 65 are `90 One of the objects of my invention isto also provided with lugs 81 through which provide a compound brake foreffectively rods 82 and 82'* pass. The rod which passes multiplying theenergy of retarding forces. through the .lug on one arm is pivotallyAnother object of my invention is to imsecured to the other arm. Asindicated, the

prove the construction of brakes, making pivotal connection between arod and the 95 them more simple and durable than those corresponding armis nearer the pivotal disclosed in the prior art, and at the samemounting of said arm than is the lug on the time possessed of all theadvantages of otherv arm, through which said rod passes, quick andeffective action. to the pivotal mounting of the latter. arm.

These and other objects are attained by Surrounding the rods 82 and 82and mter- -100 this invention, the various novel features of posedbetween the loose collars 83 and nuts which will be apparent fromthe'description 84 on said rods are coil springs or resilient `anddrawings, disclosing one embodiment of members 85 which are adapted tomultiply such invention, and will be particularly the value of theretarding eiort or force of pointed out in the appended claims. thiscompound brake. The collars 83 are 105 The invention is illustrated inthe accomlimited from sliding on the rods by stops panying drawing, inwhich, adjacent Ythereto fixed to the rods. The

Figure 1 is a side elevation of a brake de effectiveness of the coilsprings 85 as abutclockwise direction,

In operation, when the electrical connec- `tions are made, as when themotor is in operation, the magnet is energized, and the brake band 63 isout of braking engagement with the brake wheel 61. When the electricalconnections are broken, the magnet is denergized. Assuming under theseconditions that the motor is rotatin in a counterthe spring 7 3 willdrawr the arms 64 and 65 closer together, forcing the brake band 63 intoforceful contact with the brake Wheel 6I. s soon as there is anysubstantial gripping of the brake band on the brake wheel, the band iscarried along by the wheel and the arm 64 is forced or tilted to theleft compressing the coil spring 85, on that vside which draws the otherarm 65, by means of the rod 82, also to the left, forcing the brake bandinto more forceful and intimate engagement with the brake wheel and thusadding to the retarding force exerted thereon. At the point Where thebracket 69 engages the stop 71 the spring 73 and adjacent spring 85exert their maximum forces, multiplying many timesrthe value of theoriginal braking effort.

While applicant has considered the braking action in only one directionof rotation, the brake with its effect of multi lying the initialretarding force, is as e one direction of rotation-of the brake wheel asthe other. Thereversible brake necessitates the use of only onebrakewheel and brake band, depending upon the arrangement of the sprmgs andlevers for its compounding or multipl in retarding or braking effect;and the `lira e may Vhave its retarding force multiplied to any degreeby changing the design and dimensions of the various parts described.

There may be many modifications in the,

precise form and arrangement `herein shown and described, and I intendin m claims to cover all such modifications which do not involve adeparture from the spirit and scope of my invention.

It is claimed and desired to secure by Letters Patent:

1. In a brake of the band type for retarding a rotating body, a pvotedarm to which one end of the brake band is attached, and means associatedwith said arm for effecting the application of said brake, said meansbeing operative to effect an initial retardation of said rotating bodyand being subse quently operative to increase the retarding effect onsaid rotating body by utilizing power derived from said rotating body tomore tightly7 apply said brake.

2. In combination with a rotatable memective for v said rotating bodyber, means coperative with said member 3. In combination with arotatable member, a brake band coperative with said member for retardingthe same, a movable element supporting an end of said brake band, meansoperatlvely associated with said element and operative to effect theapplication of said brake band while permltting shifting thereof due torotation of said member, and means operatively associated with saidelement and operative subsequent to the initial application of saidbrake band to increase the retarding effect thereof, said latter meansbeing rendered operative through shifting of said brake band by saidrotatable member.

4. In combination with a brake wheel, a. brake band coperative' withsaid wheel for retarding the same, a plurality of movably mountedelements supporting the ends of said brake band, means operativelyassociated with said elements for effectingthe application ofsaid brakeband to said wheel and permitting shifting thereof due to rotation ofsaid wheel, and means operatively associated with said elements andrendered operative through shifting of said brake band by said Wheel forincreasin the retarding efiect of said brake band sub initialapplication thereof.

In combination with a brake wheel, a brake band coperative with saidwheel for retarding the same, a plurality of elements each of which ismounted for movement about a point and supporting an end of said brakeband, means operatively associated with said elem ,nts for effecting theapplication of said brake band and permitting shifting thereof due torotation of said Wheel, and means operative to increase the retardingeffect of said brake band on said wheel beyond that capable of beingexertedby said first means, said second means comprising adeviceconnected to said movable elements at points located at differentdistances from the points of mounting of said elements.

6. In a brake of the band t pe for retarding a rotating body, a pluraity of pivoted arms to which the brake band is attached, means foreffecting an initial application of said brake band, and means forincreasing the retarding effect of said brake band on said latter meanscomprising a connection between said arms at points located at differentdistances from the pivotal points of said arms.

sequent to thev ection for effecting the -the same, stops 7. Incombination with a brake wheel, a plurality of angularl `movable arms atall times ieldingly urge toward each other and locate one at each sideof the )wheel, abrake band secured at its ends to said arms and saidwheel for retardin limiting the movement o said arms, and means forexerting independently-,selective forces on said arms to force said bandinto engagement with saidwheel, said means comprisin a connectionbetween points located at di erent distances along said arms. v

8. In a brake for retarding a rotating body, a brake band adapted tocoperate with the rotating body to retard the same when rotatingin'either direction, and means for applying said brake band and oerative to secure a retarding effect f-or one irection of rotation thatis different from that secured for theiother 9. In combination withbrake band coperative with coperative with direction ofrotation.

a brake wheel, a said wheel for rctarding the same, a plurality ofpivoted` arms to which the ends of said brake band are attached, andmeans for moving said arms in opposite directions for effecting theapplicationof said brake band, said arms being subsequently movable inthe same difurther applicationl of said brake-band.

10. In combination with a brake wheel, a brake band coperative with saidwheel for retarding the same, a plurality of pivoted arms to which saidbrake band is attached, means for effecting the initial application ofsaid brake band, said means being attached to said arms at pointslocated at a proximately the same distance from the ivotal points ofsaid arms, and means for increasing the retarding effect of said brakeband on said wheel, said means comprising a connection between said armsat points located at different distances from the pivotal points of thearms. I

11. In combination, a rotatable member, a brake band, coperative withsaid rotatable member for retarding the same, means for effecting theapplication of said brake band toexert a retarding effect on and meansassociated with andrendered operative through said firstmentioned meanssubsequent to the exertion of an initial retarding effect on saidrotatable member for creating a total retarding effect on said membergreater than that capable of being exerted through alone, said secondmeans comprising means for causing relative movement between the ends ofsaid brake band on shifting of the latter by 'the rotating, member.

V 12. In combination with a brake wheel, a support mounted adjacent saidwheel, an arm pivoted to sald supp secured. at one end to said pivotedarm and said member,

said first mentioned means ort, a brake' band disposed between saidbrake wheel and a ortion of said arm, and means `for a pl f lng saidbrake' band to said wheel for Era ing purposes, said means beingoperatively connected to said arm on the same side ot the pivotal pointthereof as the point of attachment of said brake band thereto, andauxiliary means operative-subsequent to the arms on the same side of thepivotal point thereof as the point of attachmentof said brake bandthereto, and auxiliary means operative subsequent to the initialapplication of said brake band by said first mentioned means forincreasing the power with which said brake band is applied. 4

14. In combination with a brake wheel a brake band coperative with saidwheel or retarding the same, a plurality of pivoted arms for supportingthe ends of said brake band, means operativelyassociated with said armsfor effecting the initial application o said brak'e band, and meansassociated with said arms and operative to constitute a resilientabutment restraining movement of one or the other of said arms dependingon the direction of rotation of said wheel an to move the other arm in adirection to 1ncrease the retarding effect of said brake band on saidwheel, said lattermeans being operative to accomplish its normalfunction subseguelt to the initial application of said brake an f 15. Incombination with a brake wheel, a su port, a plurality of elementsmounted-on said support and capable of movement about their points ofmounting the lpoints of mounting of said elements eing at one side of aplane of the axis of said brake wheel andthe elements bein capable ofextending about a portion of sai wh to the opposite side of said plane,a brake and secured at its ends to portions of said elementsat thelatter side of said plane and' j dis"f ,"sed between said elements andsaidlwhee, resilient means operatively connected to eachv of saidelements on the same side of the point 'o mountin thereof as-thepoint ofattachment of said rake band thereto for Au 'ng said band intoengagement withl said bra e wheel, and auxiliary means operative, s ubseuent to the initial application of saidgbrake and by said firstmentioned means for increasing tleeower with which said brake band isapp Y J 16. In combination with a brake Wheel, a supportmounted adjacentsaid brake when fes an element mounted on said support and movable aboutits point of mount/mg, a brake of the band type secured adjacent one endto said element and disposed between said brake wheel and a portion ofsaid element, means for applying said brake to said wheel for brakingpurposes, said means being operatively connected to said element on thesame side of the point of mountin thereof as the point of attachment ofsai brake thereto, and auxiliary means associated with said movablymounted element and operative subsequent to the initial application ofsaid brake bv said first mentioned means for increasing the power withwhich said brake is applied.

17. In combination with a brake wheel, a brake coperative with saidwheel for retarding the same, a plurality of angularly movable armssupporting said' brake, and means for moving said arms in opositedirections to produce an initial bra ng effect of said brake on saidWheel, said arms being also movable in the same direction to pro- -ducean additional braking eii'ect on said brake on said wheel.

18. In combination with a rotatable niember, a retarding deviceincluding a brake band, a movable member connected to an end of saidretarding device,'a second movable member connected to another end ofsaid retarding device and means capable of resiliently restraining themovement of one of said movable members more than the other.

19'. In combination with a rotatable member, a retarding deviceincluding a brake band coperating with said rotatable mmber, a movablemember connected with an end of said retarding device, adjustableresilient means for restraining the movement of said movable member, asecond movable member connected with another end of said retardingdevice, and a second adjustable resilient means for restraining themovement of said .second movable member.`

20. In combinationwith a rotatable member, a -retarding devicelincluding a brake band, a movable member connected lto an end 'of saidretarding device, a second movable member connected to another endv ofsaid retarding device, means capableof resiliently restraining thelmovement of one of said movable members more than the other and anadjustable stop for at least one of said movable members.

In testimony whereof, the signature of the inventor is aiiixed hereto. i

HALFDAN A; STEENL Witnesses C. FABRIcms HANSEN, KARL L. Lan.

Corrections in Letters Patent No. 1,282,483.

It is hereby certified that in Letters Patent No, 1,282,483, grantedOctober 22, 1918, upon the application of Haifdan A. Steen, ofChristiania, Norway, for an improvement in Compound Band-Brakes," errorsappear in the printed specification requiring correction as follows:Page 2, line 22., after the reference-numeral 85" strike out the comma;seme page and line, after the word side" insert s,

comma; page 4, line 25, claim 17, for the word on" read of; and that theseid Letters Petent should be read with these corrections therein thatthe same may conform to the record of the cese in the Patent. Office.

sigma und sealed this 21st day of January, A. D., 1919.

F. w. H. CLAY,

Acting Commissioner of Patents.

[SEAL j

